Holiday 2002 NEPTUNE, Owner'S Manual

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Chassis Information
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2 0 0 2 N E P T U N E
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should be removed in the filtration system or during the course of an oil
change. Oil will provide a protective barrier to prevent corrosion of non-like
metals.
Internal components of the engine require cooling. The primary coolant sys-
tem cannot provide this cooling. Oil will transfer heat by contacting the various
components then transferring to the primary cooling system at the oil cooler.
The uneven surfaces are filled to react as a combustion seal within the cylinder
liner and other internal components.
Synthetic Engine Oil:
In extreme environments, where ambient temperatures can be as low as
45º C (-50º F), a petroleum based oil will not perform satisfactorily in diesel
engines. Synthetic oils were developed for these type applications. These syn-
thetic oils are blend from ester and/or hydrocarbon based oils. These base oils
are produced by chemically reacting lower molecular weight materials to man-
ufacture lubricants of desired properties. All synthetic based oils must meet the
API category III classifications and SAE viscosity grades. Synthetic oils and
petroleum-based oils should never be mixed.
Viscosity:
Viscosity is simply a measure of resistance of molecule layers moving rela-
tive to an adjacent layer. All fluid viscosity is affected by temperature. A multi-
grade lubricating oil tends to be less sensitive to temperature changes due to
formulation. Lubricating oils are generally selected for use with viscosities
appropriate for the expected operating temperature. The correct selection of a
lubricating oil of correct viscosity is critical for optimum performance. Some
effects of incorrect viscosity when the oil is too thick range from difficulty in
starting, to increasing fuel consumption and reducing power output. When the
oil is too thin, oil consumption is increased as well as wear from the metal to
metal contact. This will also increase engine noise.
Low temperature viscosity specifications are identified by a “W” (winter).
High temperature viscosity that meets the 100º C (212º F) requirements have
no suffix. When a lubricating oil meets both high and low temperature require-
ments they are classified as multi-viscosity or multigrade.
Routine Maintenance Recommendations:
1. Check oil level daily.
2. Replace oil filter at every oil drain interval.
3. Cummins Engine Company, Inc. recommends the use of high qual-
ity, API (American Petroleum Institute) licensed CH-4 or
CES20071, 15W-40, multiviscosity oil or premium oil.
4. The recommended oil drain interval is defined by the API oil per-
formance classification and the engine duty cycle. Refer to the
Cummins Operation & Maintenance Manual for complete details.